package name.fw.thread.lock;

import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @moudle: TestCondition
 * @version:v1.0
 * @author: 丰伟
 * @date: 2017年10月27日 下午5:13:57
 *
 */
public class TestCondition {

	public static void main(String[] args) {
		final Business business = new Business();
		new Thread(new Runnable() {
			@Override public void run() {
				threadExecute(business, "sub");
			}
		}).start();
		threadExecute(business, "main");
	}

	public static void threadExecute(Business business, String threadType) {
		for (int i = 0; i < 100; i++) {
			try {
				if ("main".equals(threadType)) {
					business.main(i);
				} else {
					business.sub(i);
				}
			} catch (InterruptedException e) {
				e.printStackTrace();
			}
		}
	}
}

class Business {

	private boolean bool = true;
	private Lock lock = new ReentrantLock();
	private Condition condition = lock.newCondition();

	public/* synchronized */void main(int loop) throws InterruptedException {
		lock.lock();
		try {
			while (bool) {
				condition.await();// this.wait();
			}
			for (int i = 0; i < 100; i++) {
				System.out.println("main thread seq of " + i + ", loop of " + loop);
			}
			bool = true;
			condition.signal();// this.notify();
		} finally {
			lock.unlock();
		}
	}

	public/* synchronized */void sub(int loop) throws InterruptedException {
		lock.lock();
		try {
			while (!bool) {
				condition.await();// this.wait();
			}
			for (int i = 0; i < 10; i++) {
				System.out.println("sub thread seq of " + i + ", loop of " + loop);
			}
			bool = false;
			condition.signal();// this.notify();
		} finally {
			lock.unlock();
		}
	}
}

class BoundedBuffer {

	final Lock lock = new ReentrantLock();// 锁对象
	final Condition notFull = lock.newCondition();// 写线程条件
	final Condition notEmpty = lock.newCondition();// 读线程条件
	final Object[] items = new Object[100];// 缓存队列
	int putptr/* 写索引 */, takeptr/* 读索引 */, count/* 队列中存在的数据个数 */;

	public void put(Object x) throws InterruptedException {
		lock.lock();
		try {
			while (count == items.length)
				// 如果队列满了
				notFull.await();// 阻塞写线程
			items[putptr] = x;// 赋值
			if (++putptr == items.length)
				putptr = 0;// 如果写索引写到队列的最后一个位置了，那么置为0
			++count;// 个数++
			notEmpty.signal();// 唤醒读线程
		} finally {
			lock.unlock();
		}
	}

	public Object take() throws InterruptedException {
		lock.lock();
		try {
			while (count == 0)
				// 如果队列为空
				notEmpty.await();// 阻塞读线程
			Object x = items[takeptr];// 取值
			if (++takeptr == items.length)
				takeptr = 0;// 如果读索引读到队列的最后一个位置了，那么置为0
			--count;// 个数--
			notFull.signal();// 唤醒写线程
			return x;
		} finally {
			lock.unlock();
		}
	}
}